Highly Selective Hydroformylation of Vinylarenes to Branched Aldehydes by [Rh(cod)Cl]2 Entrapped in Ionic Liquid Modified Silica Sol-Gel

2007 ◽  
Vol 2007 (28) ◽  
pp. 4706-4710 ◽  
Author(s):  
Khalil Hamza ◽  
Jochanan Blum
Keyword(s):  
Ionic Liquid ◽  
Sol Gel ◽  
Silica Sol ◽  
Modified Silica

scholarly journals Cross-Condensation Reactions in an Organically Modified Silica Sol-Gel

1994 ◽  
Vol 346 ◽  
Author(s):  
S. Prabakar ◽  
R. A. Assink ◽  
N. K. Raman ◽  
C. J. Brinker
Keyword(s):  
Experimental Error ◽  
Molecular Level ◽  
Sol Gel ◽  
Resonance Assignments ◽  
Silica Sol ◽  
Modified Silica ◽  
Organically Modified ◽  
Organically Modified Silica ◽  
Acid Catalyzed ◽  
Hydrolysis Of

ABSTRACTHigh resolution 29Si NMR has been used to study the extent of cross condensation taking place in a hybrid organic/inorganic sol-gel system. Tetraethoxysilane (TEOS) and methyltriethoxysilane (MTEOS) sol-gels were chosen for this purpose. The sols were prepared by acid catalyzed hydrolysis of TEOS and MTEOS with a H2O/Si ratio of 0.3. 29Si NMR shows signals due to both self-condensation and cross-condensation between TEOS and MTEOS. Resonance assignments were made by comparing the positions and intensities of peaks in the spectra of single and multicomponent systems. It was found that, within experimental error, the self- and cross-condensation rates are equal and that extensive molecular level mixing takes place during the early stages of the reaction.

Effect of Electrophoresis on the Efficiency of Graphite-Nano-TiO2 Modified Silica Sol–Gel Electrode

2015 ◽  
Vol 15 (5) ◽  
pp. 3405-3410 ◽  
Author(s):  
Mohammad Saeid Hejazi ◽  
Mir Reza Majidi ◽  
Sima Gholizadeh ◽  
Ezat Hamidi-Asl ◽  
Anthony P. F. Turner ◽  
...  
Keyword(s):  
Sol Gel ◽  
Silica Sol ◽  
Modified Silica

Study on Preparation and Hydrophobicity of MTES Derived Silica Sol and Gel

2012 ◽  
Vol 535-537 ◽  
pp. 2563-2566 ◽  
Author(s):  
Yu Ma ◽  
Hye Ryeon Lee ◽  
Toshinori Tsuru
Keyword(s):  
Reaction Rate ◽  
Sol Gel ◽  
Phase Segregation ◽  
Silica Sol ◽  
Molar Ratio ◽  
Modified Silica ◽  
Sol Gel Process ◽  
One Step ◽  
Inorganic Precursors

The synthesis of hydrophobic sol by one-step sol-gel process ammonia catalyzed was investigated. The water molar ratio and catalyst molar ratio were discussed to prevent phase segregation during the hydrolysis and co-condensation of the organic and inorganic precursors. The reactant system with water molar ratio 70 could make the reaction rate of MTES slightly less than that of TEOS, so that the hydrolysis - condensation – gelling reaction with MTES and TEOS as co-precursors could be synchronously. With the increase of the MTES/TEOS molar ratio, the reaction rate of the silica sol preparation decreased, the hydrophobicity of the sol and gel increased as the molar ratio MTES/TEOS change from 0.5~4. But the hydrophobicity of the methyl-modified silica sol and gel prepared with pure MTES in the sol-gel process were slightly lower than that of the methyl-modified silica sol and gel prepared with MTES and TEOS as co-precursors.

scholarly journals Sol–gel processed pyridinium ionic liquid-modified silica as a new sorbent for separation and quantification of iron in water samples

2016 ◽  
Vol 9 ◽  
pp. S587-S594 ◽  
Author(s):  
H. Abdolmohammad-Zadeh ◽  
M. Galeh-Assadi ◽  
S. Shabkhizan ◽  
H. Mousazadeh
Keyword(s):  
Ionic Liquid ◽  
Water Samples ◽  
Sol Gel ◽  
Modified Silica

Synthesis of Water-Soluble Polyacrylics Modified Silica Sol-Gel Materials

1994 ◽  
Vol 6 (10) ◽  
pp. 1737-1741 ◽  
Author(s):  
Yen Wei ◽  
Wei Wang ◽  
Dachuan Yang ◽  
Liguang Tang
Keyword(s):  
Sol Gel ◽  
Silica Sol ◽  
Water Soluble ◽  
Modified Silica

Platinum nanoparticles supported on ionic liquid-modified-silica gel: hydrogenation catalysts

RSC Advances ◽  
2014 ◽  
Vol 4 (32) ◽  
pp. 16583-16588 ◽  
Author(s):  
Lucas Foppa ◽  
Jairton Dupont ◽  
Carla W. Scheeren
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Silica Gel ◽  
Platinum Nanoparticles ◽  
Sol Gel ◽  
Modified Silica ◽  
Silica Network ◽  
Modified Silica Gel ◽  
Hydrogenation Catalysts ◽  
Gel Method

Platinum nanoparticles (ca. 2.3 nm) dispersed in ionic liquids and functionalized ionic liquids were supported within a silica network by the sol–gel method.

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